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EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Phase II Reactions: Miscellaneous Conjugation Reactions01:19

Phase II Reactions: Miscellaneous Conjugation Reactions

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Phase II biotransformations are detoxification mechanisms that conjugate xenobiotics with endogenous substances, neutralizing their toxicity.
A key example involves the conjugation of cyanide ions, which impair cellular respiration and alter hemoglobin into non-oxygen-carrying cyanmethemoglobin. To neutralize this threat, a sulfur atom from thiosulphate is transferred to the cyanide ion, catalyzed by the enzyme rhodanese, resulting in an inactive compound called thiocyanate. The production of...
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Complexation Equilibria: The Chelate Effect01:19

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Stereoisomerism02:52

Stereoisomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Coordination Number and Geometry02:57

Coordination Number and Geometry

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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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Rhodium complexes as therapeutic agents.

Dik-Lung Ma1, Modi Wang, Zhifeng Mao

  • 1Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China. edmondma@hkbu.edu.hk.

Dalton Transactions (Cambridge, England : 2003)
|January 9, 2016
PubMed
Summary
This summary is machine-generated.

Rhodium complexes are emerging as promising agents in inorganic medicinal chemistry, offering new therapeutic strategies beyond traditional platinum and ruthenium drugs. This research explores their diverse biological activities against various targets.

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Area of Science:

  • Inorganic medicinal chemistry
  • Coordination chemistry
  • Drug discovery

Background:

  • Platinum and ruthenium complexes have historically dominated inorganic medicinal chemistry.
  • Rhodium complexes are gaining attention for their unique chemical and biological properties.
  • These properties allow for distinct mechanisms of action compared to existing drugs.

Purpose of the Study:

  • To highlight recent advancements in rhodium-based inorganic medicinal chemistry.
  • To showcase the diverse biological activities of rhodium complexes.
  • To explore their potential against various therapeutic targets.

Main Methods:

  • Literature review of recent studies on rhodium complexes in medicinal chemistry.
  • Analysis of biological activities reported for rhodium complexes.
  • Identification of targets including enzymes and protein-protein interactions.

Main Results:

  • Rhodium complexes exhibit a wide range of biological activities.
  • These complexes show efficacy against various disease-related targets.
  • Examples include inhibition of enzymes and disruption of protein-protein interactions.

Conclusions:

  • Rhodium complexes represent a promising new class of therapeutic agents.
  • Their tunable properties offer advantages over traditional metal-based drugs.
  • Further research into rhodium complexes could lead to novel cancer therapies.